Sources said NVBDCP has written to all the big hospitals in Delhi to be prepared for handling a large number of dengue cases.
Even private hospitals like Max, Apollo, Batra and Fortis too have reported an increase in dengue cases.
Civic agencies like MCD and NDMC, and the National Vector Borne Disease Control Programme (NVBDCP) say that massive breeding has been found in several parts of Delhi, especially in Commonwealth Games venues.
"The entire city is dug up and we have had a good monsoon this time. Due to short spells of rain, the weather is conducive for breeding of the dengue mosquito," said Dr R S Sharma, joint director, dengue, NVBDCP.
"Compared to 2009, this year we are seeing more number of cases," said Dr DK Sharma, medical superintendent, AIIMS.
"Every 3-4 years, more number of dengue cases are reported. To control breeding, people have to be more conscious about their surroundings and ensure that water doesn't collect near their houses," said a senior doctor with NVBDCP.